Abrading wheel



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Patented June 12, 1951 UNITED STATES PATENT OFFICE ABRADING WHEEL Elisha W. Hall, Scituate, Mass.

Application April 21, 1948, Serial No. 22,433

3 Claims.

This invention relates to the art of abrading and is concerned with a novel and improved abrading wheel comprising a novel abrading ring, and a novel hub arranged in a novel assembly. The abrading ring is fabricated in a novel manner to minimize loss of material during manufacture. The abrading ring is of novel form enabling it to be attached to a hub in a novel manner. The hub is of novel form to receive the abrading ring or to receive several distinct abrading elements in place of an abrading ring. The form of the abrading ring is such that it is suitable for attachment to hubs of other constructions. The invention will best be understood by reference to the following description when taken in connection with the accompanying drawings of one specific embodiment thereof, while its scope will be pointed out more particularly in the appended claims.

In the drawings:

Fig. 1 is a side elevation of an abrading wheel embodying the invention, part of one of the retaining plates being broken away to clarify the disclosure;

Fig. 2 is a sectional view of the abrading ring on the arcuate section line 2-2 of Fig. 1;

Fig. 3 is a side elevation of-the central plate of the hub;

Fig. 4 is a plan of a portion of the central plate of the hub;

Fig. 5 is an elevation. of a portion of the biascut strip of abrading material with its alternating notches and perforated tabs or tongues for attachment to the hub;

Fig. 6 is an elevation of a strip of bias-cut cloth, showing the manner of cutting to produce two strips with complementary tongues and notches.

Referring to the drawings and to the embodiment of the invention illustrated therein as one example, and having reference at first to Fig. 1, there is shown an abrading wheel having a single abrading element in the nature of a ring 8 of novel form now to be described. By reference to Fig. 2 it will be observed that the ring is-sinuous and further that it is characterized by distinct, inverted pleats (or box pleats, depending on how you look at them) or flutes l0, one set on one face of the ring and a second set on the other face of the ring, the pleats on one face alternating with those on the other face.

The ring is still further characterized by the fact that its inner margin is indentured (see Fig. 5) as by the provision of tongues or tabs I2 alternating with notches l4. Looked at in an- 2 other way we may say that the inner portion of the ring is cut away at intervals to define the intervening tongues 12. The number of tongues or tabs I2 is equal to the number of pleats or flutes it). Thus, each pleat has a tongue (see Fig. 1) for attachment to a hub hereinafter described, one set of tongues being attached to one side of the hub and another set of tongues being attached to the other side of the hub, as will appear from an inspection of Fig. 1 wherein one set of tongues is shown in full lines and the other set in dotted lines. To avoid interference of the tongues with one another when assembled (see Fig. 1) the tongues are tapered or narrowed toward their ends.

To avoid loss of material, the tongues l2 and the notches M are of the same size and shape and are formed by irregular cutting (see Fig. 6) with suitable dies from a strip [6 of material such as cloth, preferably bias-cut, as shown, and out along a central zone, thus forming two complementary, indented strips I8, each with its described tongues and indentations. Holes 20 to facilitate attachment to the hub may be punched now or later, though it is convenient to punch them at this time. The strip I6 is of indefinite length, this being possible by piecing diagonal (45) edges together by zig-zag or over and over stitching 22.

As the completed ring is multi-ply (see Fig. 2) the plies can be superposed and built up by winding the indented strip I8 round and round, taking care that its tongues l2 are brought into coincidence during the winding. This can be insured by mechanical means such as a jig if desired. When the winding is complete there will be only two ends of the strip l8 appearing in the completed assembly which forms the ring 8.

In the present example, the plies are conveniently secured to one another, the tongues are maintained in coincidence, and the openings in them are protected from wear and tear by permanently uniting the plies of each tongue as by a grommet 24 in the nature of a tubular rivet passing through the registering holes 20 of the tongue, the cylindrical barrel of the grommet forming a bushing for the holes. Because of the half-round form of the projections 28 a large open space is left in the interior of the bushing portion of grommet 24 through which air may pass for ventilation (see Fig. 1). Each of the ventilation openings thus provided communicates with the radial passageway formed by a flute I0 (see Fig. 2 in connection with Fig. 1).

The sinuous or undulating form of the ring is a distinct advantage for several reasons. One of these reasons is a desired action on the work in the direction of the axis of rotation. Another reason is the convenience of attachment to opposite sides of a hub such as that now to be described, reference being had to Figs. 3 and 4. In the present example, the hub is extremely simple and comprises a single web or disk 26 of metal, for example, with two sets of projections 28 at its periphery which are bent over at right angles to the plane of the disc and shaped to concave-convex form with the concavity facing upwardly to provide at their inner surface side cylindrical surfaces providing bearings for the bushings formed by grommets 24. Herein the projections 28 extend alternately in opposite directions, one from one face of the disc and the next from the other. Between the lugs 28 there are notches 30 through which the inner margin of the ring 8 (at the notches 14) passes from side to side of the web or disk 26. The ring is assembled with the disk by placing one set of grommets on one set of lugs and the alternate set of grommets on the alternate set of lugs. Thus, the tongues 52 lie alternately on opposite sides of the disk.

Escape of the tongues l2 from the lugs 28 is prevented as by retainers such as disks 3| (see Fig. 1) one on each side, provided in the present example with notches 32 receiving the lugs 26. These disks are conveniently held in place by screws 34 (see Fig. 1) which, in the present example, are threaded into central bosses 36 on both sides of the disk 26. The disk 26, with its bosses 36, is provided with a central hole 33 (see Fig. 3) and the retainer disks 30 are provided with like holes 40 (see Fig. 1) to receive an arbor (not shown) which commonly receives several of the described wheels. Preferably, the axial dimension of each boss 36 is such that the retainer disk 30, while retaining the grommets .24 on the lugs '28, does not actually clamp the grommets but leaves them free to rock on the lugs.

Having thus described one embodiment of the invention, What I claim is:

1. A central support member for abrading material comprising a disc centrally apertured to receive a shaft and have tongues at intervals about its periphery bent over at right angles to the disc and curved to a circular arc with its concavity facing outwardly whereby they provide when engaged 'by a cylindrical bushing a rocking bearing for such bushing and a ventilating opening through the same.

2. In an abrading wheel in combination with a supporting disc having projections adjacent its periphery at either radial face thereof extending substantially parallel to the axis, an abrading element in the form of a ring of flexible abrading material, which ring has a circular series of spaced openings at its inner side and is cut away between said openings, the portion of the ring outward of said cutaway portions being an annulus the inner perimeter of which is substantially longer than the circumference of said disc, successive openings in the element being engaged with disaligned projections on opposite sides of the disc, the annulus crossing the edge of the disc between said projections with said edge entering the cutaway portions between the openings, the annulus being gathered into substantially radial pleats reducing its eifective inner circumference to that of the disc, the openings having cylindrical bushings and the projections being of half round cross section to engage the lower parts of the bushings and to leave a ventilating opening therethrough.

3. In an abrading wheel in combination with a supporting disc having projections of half round cross section adjacent its periphery and extending outwardly at either radial face of the disc substantially parallel to the axis, a mass of abrading material mounted about the periphery of the disc comprising an element having spaced openings at its inner side and cylindrical bushings in said openings, the inner edge of the element being cut away between said openings, the element crossing the edge of the disc with its said edge entering the cutaway portion and the bushings receiving said projections, which latter engage the lower parts of the bushings to leave a ventilating opening through the latter, the distance between the openings measured while the element is extended being greater than the distance between the projections engaged thereby to provide a fullness in the element between its points of anchorage on the projections.

ELISI-IA W. HALL.

REFERENCES CITED The following references are of record in the file of this patent:

; UNITED STATES PATENTS Germany Mar. 12, 1929 

